/*
GanttProject is an opensource project management tool.
Copyright (C) 2009 Dmitry Barashev

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/
package org.ganttproject.impex.htmlpdf;

import java.awt.Color;
import java.awt.Component;

import javax.swing.Box;
import javax.swing.DefaultCellEditor;
import javax.swing.JComboBox;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableModel;

import org.ganttproject.impex.htmlpdf.FontSubstitutionModel.FontSubstitution;

public class FontSubstitutionPanel {

    private FontSubstitutionModel myModel;
    private JComboBox myFamiliesComboBox;
    private JLabel myMessage;
    
    public FontSubstitutionPanel(FontSubstitutionModel fontConfigurationModel) {
        myModel = fontConfigurationModel;
    }

    public Component getComponent() {
        TableModel tableModel = new AbstractTableModel() {
            public int getColumnCount() {
                return 2;
            }
            public int getRowCount() {
                return myModel.getSubstitutions().size();
            }
            public Object getValueAt(int rowIndex, int columnIndex) {
                FontSubstitution substitution = getSubstitution(rowIndex);
                switch (columnIndex) {
                case 0:
                    return substitution.myOriginalFamily;
                case 1:
                    return substitution.getSubstitutionFamily();
                default:
                    assert false;
                    throw new IllegalStateException();    
                }
            }
            public boolean isCellEditable(int rowIndex, int columnIndex) {
                return columnIndex==1;
            }
            public void setValueAt(Object value, int rowIndex, int columnIndex) {
                assert columnIndex==1;
                assert value instanceof String;
                getSubstitution(rowIndex).setSubstitutionFamily((String)value);
                updateFontStatusMessage();
            }
            public String getColumnName(int column) {
                switch (column) {
                case 0:
                    return "Theme font";
                case 1:
                    return "Substitution";
                default:
                    assert false;
                    throw new IllegalStateException(); 
                }                    
            }
            
        };
        JTable table = new JTable(tableModel);
        table.setRowHeight(30);
        
        class CellRendererImpl implements TableCellRenderer {            
            private DefaultTableCellRenderer myDefaultRenderer = new DefaultTableCellRenderer();
            public Component getTableCellRendererComponent(
                    JTable table, Object value, boolean isSelected, boolean hasFocus,
                    int row, int column) {
                 JLabel result = (JLabel) myDefaultRenderer.getTableCellRendererComponent(
                         table, value, isSelected, hasFocus, row, column);
                 FontSubstitution substitution = getSubstitution(row);
                 if (!substitution.isResolved() || column==0) {
                     result.setFont(result.getFont().deriveFont(16f));
                 }
                 else {
                     result.setFont(substitution.getSubstitutionFont().deriveFont(16f));
                 }
                 if (substitution.isResolved()) {
                     result.setForeground(Color.BLACK);
                 }
                 else {
                     result.setForeground(Color.RED);
                 }
                 return result;
            }                        
        }
        
        myFamiliesComboBox = new JComboBox(myModel.getAvailableSubstitutionFamilies().toArray(new String[0]));
        table.getColumnModel().getColumn(0).setCellRenderer(new CellRendererImpl());
        
        table.getColumnModel().getColumn(1).setCellRenderer(new CellRendererImpl());
        table.getColumnModel().getColumn(1).setCellEditor(new DefaultCellEditor(myFamiliesComboBox));
        table.getTableHeader().setVisible(true);
        
        myMessage = new JLabel(getMessageText());
        myMessage.setAlignmentX(0);
        Box result = Box.createVerticalBox();
        result.add(myMessage);
        result.add(Box.createVerticalStrut(5));
        result.add(new JScrollPane(table));
        return result;
    }

    private void updateFontStatusMessage() {
        myMessage.setText(getMessageText());
    }

    private String getMessageText() {
        return myModel.hasUnresolvedFonts() ? 
                "<html><p><b>Some fonts used in the selected theme have not been found</b></p>"
                + "<p>You may define substitutions in the table</p></html>"
                : "<html>All fonts have been found.</html>";
    }

    private FontSubstitution getSubstitution(int row) {
        return (FontSubstitution) myModel.getSubstitution(row);
    }
}
